Range Extender

I know this question has been asked before so I apologise but I just want a little advice about what to buy.
I frequently stay in hotels in my job and the standard of the wireless networks there leaves a lot to be desired on occasions. Frequently I am unable to get a strong enough signal in my room and I have to move to the bar/reception to get a strong signal.
I bought this but it hasn't improved the situation much.
I was looking at these two wireless range extenders:

1. Keenan Systems Wireless Store Featuring Engenius
2. hField Technologies, Inc.

I need something that will work through walls, as distance is not the problem.
Are either of these likely to do what I want?

You could try buying a wireless USB adapter with a detachable antenna, that way you could attach a higher gain antenna if your not getting adequate signal.

For example:
Wireless Garden - Detail

Borgslayer